Jason Statham has never done an American Accent, Jason Statham has done a Jason Statham accent.

But I agree, Jim Carrey seems to be mostly for needing a big name in the film, and whilst his voice work can be sometimes, Horton Hears A Who for example, here where the film is trying hard to be traditional, too much comedy and odd voices is rather off-putting. And yet most American critics seem to praise Carrey's accent, maybe they've not heard real English people speak before.

I'd nominate Michael Caine as Scrooge, he pulled it off once before, in my mind's eye he's the only Scrooge.

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Last three films seen on the big screen:
Law Abiding Citizen - 5/10
2012 - 5/10
A Serious Man - 6/10